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   ► KBProgrammingJavaStandard JavaOOP   Print This     
 
Java OOP:
Java Constructors (Use class name)
 
Posted 11 years ago on 10/24/2008 and updated 1/23/2009
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KB101420



General Info: Class Constructor

Constructors are called when you instantiate an object from a class. This is where you can initialize variables and put code you wish executed each time the class is created. When you initially set the member fields and properties of an object, you are initializing the state of the object. The state of an object is the values of all it's member fields and properties at a given time.

Languages Focus: Constructor

What is the syntax? Can you overload constructors? Is a special method name reserved for constructors?

Java Constructors

A method with the same name as the class.

Syntax Example:
public class Cyborg{
  //Constructors have the same name as the class.
  public Cyborg() {
  }
}

More Info

Definition:  Class Constructor

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Beginner

1 Beginner Level Question

Question #1: Multiple Choice

In C++, when you create an object instance from a class, C++ calls a special member function named what?

Answer:
1. 

New

2. 

Same name as the class.

3. 

Class_Initialize

4. 

~ + class name, i.e. ~Person

5. 

Create


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